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The Journal of Thoracic and Cardiovascular Surgery, Vol 90, 172-178, Copyright © 1985 by The American Association for Thoracic Surgery and The Western Thoracic Surgical Association
SC Fell, FP Mollenkopf, CM Montefusco, S Mitsudo, SL Kamholz, J Goldsmith and FJ Veith
Ischemia of the donor bronchus, perfused solely by retrograde collaterals
from the pulmonary circulation, is an important factor in the impaired
healing of the bronchial anastomosis of transplanted lungs. The healing of
two experimental models of bronchial anastomotic ischemia, the bronchial
segmental autograft and the postpneumonectomy bronchial autograft, was
assessed in dogs. The application of a polytetrafluoroethylene wrap to the
bronchial segmental autograft and the application of an intercostal pedicle
flap to the postpneumonectomy bronchial autograft, with and without
concomitant administration of corticosteroids, were also studied to
elucidate factors that affect bronchial anastomotic healing. The bronchial
segmental autograft healed normally without stricture, but isolation of
this autograft from the mediastinum and lung by the polytetrafluoroethylene
wrap resulted in necrosis of the autograft. All dogs that had a
postpneumonectomy bronchial autograft died of bronchopleural fistulas due
to autograft necrosis. Application of an intercostal pedicle flap to the
autograft resulted in healing in all animals. Arteriography and Microfil
injection demonstrated revascularization of the postpneumonectomy bronchial
autograft by the pedicled intercostal artery. Several conclusions can be
drawn: With the lung in situ the bronchial segmental autograft survives,
probably as a free composite graft. In contrast, the postpneumonectomy
bronchial autograft is an excellent model of bronchial anastomotic
ischemia. The intercostal pedicle flap is a reliable method for providing
neovascularity and mechanical reinforcement to an ischemic bronchial
anastomosis. Its effect on bronchial anastomotic healing was not diminished
by administration of corticosteroids. The intercostal pedicle flap may be
useful in preventing bronchial anastomotic complications in clinical lung
transplantation.
ARTICLES
Revascularization of ischemic bronchial anastomoses by an intercostal pedicle flap
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